/*!
 * Signature Pad v3.0.0-beta.3 | https://github.com/szimek/signature_pad
 * (c) 2018 Szymon Nowak | Released under the MIT license
 */

var Point = (function () {
    function Point(x, y, time) {
        this.x = x;
        this.y = y;
        this.time = time || Date.now();
    }
    Point.prototype.distanceTo = function (start) {
        return Math.sqrt(Math.pow(this.x - start.x, 2) + Math.pow(this.y - start.y, 2));
    };
    Point.prototype.equals = function (other) {
        return this.x === other.x && this.y === other.y && this.time === other.time;
    };
    Point.prototype.velocityFrom = function (start) {
        return this.time !== start.time
            ? this.distanceTo(start) / (this.time - start.time)
            : 0;
    };
    return Point;
}());

var Bezier = (function () {
    function Bezier(startPoint, control2, control1, endPoint, startWidth, endWidth) {
        this.startPoint = startPoint;
        this.control2 = control2;
        this.control1 = control1;
        this.endPoint = endPoint;
        this.startWidth = startWidth;
        this.endWidth = endWidth;
    }
    Bezier.fromPoints = function (points, widths) {
        var c2 = this.calculateControlPoints(points[0], points[1], points[2]).c2;
        var c3 = this.calculateControlPoints(points[1], points[2], points[3]).c1;
        return new Bezier(points[1], c2, c3, points[2], widths.start, widths.end);
    };
    Bezier.calculateControlPoints = function (s1, s2, s3) {
        var dx1 = s1.x - s2.x;
        var dy1 = s1.y - s2.y;
        var dx2 = s2.x - s3.x;
        var dy2 = s2.y - s3.y;
        var m1 = { x: (s1.x + s2.x) / 2.0, y: (s1.y + s2.y) / 2.0 };
        var m2 = { x: (s2.x + s3.x) / 2.0, y: (s2.y + s3.y) / 2.0 };
        var l1 = Math.sqrt(dx1 * dx1 + dy1 * dy1);
        var l2 = Math.sqrt(dx2 * dx2 + dy2 * dy2);
        var dxm = m1.x - m2.x;
        var dym = m1.y - m2.y;
        var k = l2 / (l1 + l2);
        var cm = { x: m2.x + dxm * k, y: m2.y + dym * k };
        var tx = s2.x - cm.x;
        var ty = s2.y - cm.y;
        return {
            c1: new Point(m1.x + tx, m1.y + ty),
            c2: new Point(m2.x + tx, m2.y + ty)
        };
    };
    Bezier.prototype.length = function () {
        var steps = 10;
        var length = 0;
        var px;
        var py;
        for (var i = 0; i <= steps; i += 1) {
            var t = i / steps;
            var cx = this.point(t, this.startPoint.x, this.control1.x, this.control2.x, this.endPoint.x);
            var cy = this.point(t, this.startPoint.y, this.control1.y, this.control2.y, this.endPoint.y);
            if (i > 0) {
                var xdiff = cx - px;
                var ydiff = cy - py;
                length += Math.sqrt(xdiff * xdiff + ydiff * ydiff);
            }
            px = cx;
            py = cy;
        }
        return length;
    };
    Bezier.prototype.point = function (t, start, c1, c2, end) {
        return (start * (1.0 - t) * (1.0 - t) * (1.0 - t))
            + (3.0 * c1 * (1.0 - t) * (1.0 - t) * t)
            + (3.0 * c2 * (1.0 - t) * t * t)
            + (end * t * t * t);
    };
    return Bezier;
}());

function throttle(fn, wait) {
    if (wait === void 0) { wait = 250; }
    var previous = 0;
    var timeout = null;
    var result;
    var storedContext;
    var storedArgs;
    var later = function () {
        previous = Date.now();
        timeout = null;
        result = fn.apply(storedContext, storedArgs);
        if (!timeout) {
            storedContext = null;
            storedArgs = [];
        }
    };
    return function wrapper() {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        var now = Date.now();
        var remaining = wait - (now - previous);
        storedContext = this;
        storedArgs = args;
        if (remaining <= 0 || remaining > wait) {
            if (timeout) {
                clearTimeout(timeout);
                timeout = null;
            }
            previous = now;
            result = fn.apply(storedContext, storedArgs);
            if (!timeout) {
                storedContext = null;
                storedArgs = [];
            }
        }
        else if (!timeout) {
            timeout = window.setTimeout(later, remaining);
        }
        return result;
    };
}

export default function SignaturePad(canvas, options) {
    if (options === void 0) { options = {}; }
    var _this = this;
    this.canvas = canvas;
    this.options = options;
    // 鼠标左键
    this._handleMouseDown = function (event) {
        if (event.which === 1) {
            _this._mouseButtonDown = true;
            _this._strokeBegin(event);
        }
    };
    this._handleMouseMove = function (event) {
        if (_this._mouseButtonDown) {
            _this._strokeMoveUpdate(event);
        }
    };
    this._handleMouseUp = function (event) {
        if (event.which === 1 && _this._mouseButtonDown) {
            _this._mouseButtonDown = false;
            _this._strokeEnd(event);
        }
    };
    this._handleTouchStart = function (event) {
        event.preventDefault();
        if (event.targetTouches.length === 1) {
            var touch = event.changedTouches[0];
            _this._strokeBegin(touch);
        }
    };
    this._handleTouchMove = function (event) {
        event.preventDefault();
        var touch = event.targetTouches[0];
        _this._strokeMoveUpdate(touch);
    };
    this._handleTouchEnd = function (event) {
        var wasCanvasTouched = event.target === _this.canvas;
        if (wasCanvasTouched) {
            event.preventDefault();
            var touch = event.changedTouches[0];
            _this._strokeEnd(touch);
        }
    };
    this.velocityFilterWeight = options.velocityFilterWeight || 0.7;
    this.minWidth = options.minWidth || 0.5;
    this.maxWidth = options.maxWidth || 2.5;
    this.throttle = ('throttle' in options ? options.throttle : 16);
    this.minDistance = ('minDistance' in options
        ? options.minDistance
        : 5);
    if (this.throttle) {
        this._strokeMoveUpdate = throttle(SignaturePad.prototype._strokeUpdate, this.throttle);
    }
    else {
        this._strokeMoveUpdate = SignaturePad.prototype._strokeUpdate;
    }
    this.dotSize =
        options.dotSize ||
            function dotSize() {
                return (this.minWidth + this.maxWidth) / 2;
            };
    this.penColor = options.penColor || 'black';
    this.backgroundColor = options.backgroundColor || 'rgba(0,0,0,0)';
    this.onBegin = options.onBegin;
    this.onEnd = options.onEnd;
    this._ctx = canvas.getContext('2d');
    this.clear();
    this.on();
}
SignaturePad.prototype.clear = function () {
    var ctx = this._ctx;
    var canvas = this.canvas;
    ctx.fillStyle = this.backgroundColor;
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.fillRect(0, 0, canvas.width, canvas.height);
    this._data = [];
    this._reset();
    this._isEmpty = true;
};
SignaturePad.prototype.fromDataURL = function (dataUrl, options, callback) {
    var _this = this;
    if (options === void 0) { options = {}; }
    var image = new Image();
    var ratio = options.ratio || window.devicePixelRatio || 1;
    var width = options.width || this.canvas.width / ratio;
    var height = options.height || this.canvas.height / ratio;
    this._reset();
    image.onload = function () {
        _this._ctx.drawImage(image, 0, 0, width, height);
        if (callback) {
            callback();
        }
    };
    image.onerror = function (error) {
        if (callback) {
            callback(error);
        }
    };
    image.src = dataUrl;
    this._isEmpty = false;
};
SignaturePad.prototype.toDataURL = function (type, encoderOptions) {
    if (type === void 0) { type = 'image/png'; }
    switch (type) {
        case 'image/svg+xml':
            return this._toSVG();
        default:
            return this.canvas.toDataURL(type, encoderOptions);
    }
};
SignaturePad.prototype.on = function () {
    this.canvas.style.touchAction = 'none';
    this.canvas.style.msTouchAction = 'none';
    if (window.PointerEvent) {
        this._handlePointerEvents();
    }
    else {
        this._handleMouseEvents();
        if ('ontouchstart' in window) {
            this._handleTouchEvents();
        }
    }
};
SignaturePad.prototype.off = function () {
    this.canvas.style.touchAction = 'auto';
    this.canvas.style.msTouchAction = 'auto';
    this.canvas.removeEventListener('pointerdown', this._handleMouseDown);
    this.canvas.removeEventListener('pointermove', this._handleMouseMove);
    document.removeEventListener('pointerup', this._handleMouseUp);
    this.canvas.removeEventListener('mousedown', this._handleMouseDown);
    this.canvas.removeEventListener('mousemove', this._handleMouseMove);
    document.removeEventListener('mouseup', this._handleMouseUp);
    this.canvas.removeEventListener('touchstart', this._handleTouchStart);
    this.canvas.removeEventListener('touchmove', this._handleTouchMove);
    this.canvas.removeEventListener('touchend', this._handleTouchEnd);
};
SignaturePad.prototype.isEmpty = function () {
    return this._isEmpty;
};
SignaturePad.prototype.fromData = function (pointGroups) {
    var _this = this;
    this.clear();
    this._fromData(pointGroups, function (_a) {
        var color = _a.color, curve = _a.curve;
        return _this._drawCurve({ color: color, curve: curve });
    }, function (_a) {
        var color = _a.color, point = _a.point;
        return _this._drawDot({ color: color, point: point });
    });
    this._data = pointGroups;
};
SignaturePad.prototype.toData = function () {
    return this._data;
};
SignaturePad.prototype._strokeBegin = function (event) {
    var newPointGroup = {
        color: this.penColor,
        points: []
    };
    if (typeof this.onBegin === 'function') {
        this.onBegin(event);
    }
    this._data.push(newPointGroup);
    this._reset();
    this._strokeUpdate(event);
};
SignaturePad.prototype._strokeUpdate = function (event) {
    var x = event.clientX;
    var y = event.clientY;
    var point = this._createPoint(x, y);
    var lastPointGroup = this._data[this._data.length - 1];
    var lastPoints = lastPointGroup.points;
    var lastPoint = lastPoints.length > 0 && lastPoints[lastPoints.length - 1];
    var isLastPointTooClose = lastPoint
        ? point.distanceTo(lastPoint) <= this.minDistance
        : false;
    var color = lastPointGroup.color;
    if (!lastPoint || !(lastPoint && isLastPointTooClose)) {
        var curve = this._addPoint(point);
        if (!lastPoint) {
            this._drawDot({ color: color, point: point });
        }
        else if (curve) {
            this._drawCurve({ color: color, curve: curve });
        }
        lastPoints.push({
            time: point.time,
            x: point.x,
            y: point.y
        });
    }
};
SignaturePad.prototype._strokeEnd = function (event) {
    this._strokeUpdate(event);
    if (typeof this.onEnd === 'function') {
        this.onEnd(event);
    }
};
SignaturePad.prototype._handlePointerEvents = function () {
    this._mouseButtonDown = false;
    this.canvas.addEventListener('pointerdown', this._handleMouseDown);
    this.canvas.addEventListener('pointermove', this._handleMouseMove);
    document.addEventListener('pointerup', this._handleMouseUp);
};
SignaturePad.prototype._handleMouseEvents = function () {
    this._mouseButtonDown = false;
    this.canvas.addEventListener('mousedown', this._handleMouseDown);
    this.canvas.addEventListener('mousemove', this._handleMouseMove);
    document.addEventListener('mouseup', this._handleMouseUp);
};
SignaturePad.prototype._handleTouchEvents = function () {
    this.canvas.addEventListener('touchstart', this._handleTouchStart);
    this.canvas.addEventListener('touchmove', this._handleTouchMove);
    this.canvas.addEventListener('touchend', this._handleTouchEnd);
};
SignaturePad.prototype._reset = function () {
    this._lastPoints = [];
    this._lastVelocity = 0;
    this._lastWidth = (this.minWidth + this.maxWidth) / 2;
    this._ctx.fillStyle = this.penColor;
};
SignaturePad.prototype._createPoint = function (x, y) {
    var rect = this.canvas.getBoundingClientRect();
    return new Point(x - rect.left, y - rect.top, new Date().getTime());
};
SignaturePad.prototype._addPoint = function (point) {
    var _lastPoints = this._lastPoints;
    _lastPoints.push(point);
    if (_lastPoints.length > 2) {
        if (_lastPoints.length === 3) {
            _lastPoints.unshift(_lastPoints[0]);
        }
        var widths = this._calculateCurveWidths(_lastPoints[1], _lastPoints[2]);
        var curve = Bezier.fromPoints(_lastPoints, widths);
        _lastPoints.shift();
        return curve;
    }
    return null;
};
SignaturePad.prototype._calculateCurveWidths = function (startPoint, endPoint) {
    var velocity = this.velocityFilterWeight * endPoint.velocityFrom(startPoint) +
        (1 - this.velocityFilterWeight) * this._lastVelocity;
    var newWidth = this._strokeWidth(velocity);
    var widths = {
        end: newWidth,
        start: this._lastWidth
    };
    this._lastVelocity = velocity;
    this._lastWidth = newWidth;
    return widths;
};
SignaturePad.prototype._strokeWidth = function (velocity) {
    return Math.max(this.maxWidth / (velocity + 1), this.minWidth);
};
SignaturePad.prototype._drawCurveSegment = function (x, y, width) {
    var ctx = this._ctx;
    ctx.moveTo(x, y);
    ctx.arc(x, y, width, 0, 2 * Math.PI, false);
    this._isEmpty = false;
};
SignaturePad.prototype._drawCurve = function (_a) {
    var color = _a.color, curve = _a.curve;
    var ctx = this._ctx;
    var widthDelta = curve.endWidth - curve.startWidth;
    var drawSteps = Math.floor(curve.length()) * 2;
    ctx.beginPath();
    ctx.fillStyle = color;
    for (var i = 0; i < drawSteps; i += 1) {
        var t = i / drawSteps;
        var tt = t * t;
        var ttt = tt * t;
        var u = 1 - t;
        var uu = u * u;
        var uuu = uu * u;
        var x = uuu * curve.startPoint.x;
        x += 3 * uu * t * curve.control1.x;
        x += 3 * u * tt * curve.control2.x;
        x += ttt * curve.endPoint.x;
        var y = uuu * curve.startPoint.y;
        y += 3 * uu * t * curve.control1.y;
        y += 3 * u * tt * curve.control2.y;
        y += ttt * curve.endPoint.y;
        var width = curve.startWidth + ttt * widthDelta;
        this._drawCurveSegment(x, y, width);
    }
    ctx.closePath();
    ctx.fill();
};
SignaturePad.prototype._drawDot = function (_a) {
    var color = _a.color, point = _a.point;
    var ctx = this._ctx;
    var width = typeof this.dotSize === 'function' ? this.dotSize() : this.dotSize;
    ctx.beginPath();
    this._drawCurveSegment(point.x, point.y, width);
    ctx.closePath();
    ctx.fillStyle = color;
    ctx.fill();
};
SignaturePad.prototype._fromData = function (pointGroups, drawCurve, drawDot) {
    for (var _i = 0, pointGroups_1 = pointGroups; _i < pointGroups_1.length; _i++) {
        var group = pointGroups_1[_i];
        var color = group.color, points = group.points;
        if (points.length > 1) {
            for (var j = 0; j < points.length; j += 1) {
                var basicPoint = points[j];
                var point = new Point(basicPoint.x, basicPoint.y, basicPoint.time);
                this.penColor = color;
                if (j === 0) {
                    this._reset();
                }
                var curve = this._addPoint(point);
                if (curve) {
                    drawCurve({ color: color, curve: curve });
                }
            }
        }
        else {
            this._reset();
            drawDot({
                color: color,
                point: points[0]
            });
        }
    }
};
SignaturePad.prototype._toSVG = function () {
    var _this = this;
    var pointGroups = this._data;
    var ratio = Math.max(window.devicePixelRatio || 1, 1);
    var minX = 0;
    var minY = 0;
    var maxX = this.canvas.width / ratio;
    var maxY = this.canvas.height / ratio;
    var svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
    svg.setAttribute('width', this.canvas.width.toString());
    svg.setAttribute('height', this.canvas.height.toString());
    this._fromData(pointGroups, function (_a) {
        var color = _a.color, curve = _a.curve;
        var path = document.createElement('path');
        if (!isNaN(curve.control1.x) &&
            !isNaN(curve.control1.y) &&
            !isNaN(curve.control2.x) &&
            !isNaN(curve.control2.y)) {
            var attr = "M " + curve.startPoint.x.toFixed(3) + "," + curve.startPoint.y.toFixed(3) + " " +
                ("C " + curve.control1.x.toFixed(3) + "," + curve.control1.y.toFixed(3) + " ") +
                (curve.control2.x.toFixed(3) + "," + curve.control2.y.toFixed(3) + " ") +
                (curve.endPoint.x.toFixed(3) + "," + curve.endPoint.y.toFixed(3));
            path.setAttribute('d', attr);
            path.setAttribute('stroke-width', (curve.endWidth * 2.25).toFixed(3));
            path.setAttribute('stroke', color);
            path.setAttribute('fill', 'none');
            path.setAttribute('stroke-linecap', 'round');
            svg.appendChild(path);
        }
    }, function (_a) {
        var color = _a.color, point = _a.point;
        var circle = document.createElement('circle');
        var dotSize = typeof _this.dotSize === 'function' ? _this.dotSize() : _this.dotSize;
        circle.setAttribute('r', dotSize.toString());
        circle.setAttribute('cx', point.x.toString());
        circle.setAttribute('cy', point.y.toString());
        circle.setAttribute('fill', color);
        svg.appendChild(circle);
    });
    var prefix = 'data:image/svg+xml;base64,';
    var header = '<svg' +
        ' xmlns="http://www.w3.org/2000/svg"' +
        ' xmlns:xlink="http://www.w3.org/1999/xlink"' +
        (" viewBox=\"" + minX + " " + minY + " " + maxX + " " + maxY + "\"") +
        (" width=\"" + maxX + "\"") +
        (" height=\"" + maxY + "\"") +
        '>';
    var body = svg.innerHTML;
    if (body === undefined) {
        var dummy = document.createElement('dummy');
        var nodes = svg.childNodes;
        dummy.innerHTML = '';
        for (var i = 0; i < nodes.length; i += 1) {
            dummy.appendChild(nodes[i].cloneNode(true));
        }
        body = dummy.innerHTML;
    }
    var footer = '</svg>';
    var data = header + body + footer;
    return prefix + btoa(data);
};


